just understand I don't want to sound like a ball buster
I'm just concerned it will topple over
big mess lots of lost $$ and time ect
if it wobbles in the least it wont hold for long
those brackets wont do anything for structural support you do know that right

yes you used 5 1/2 inch nails I understand that but do you realize driving a nail up into a 2x4 how it actually weakens the board it will split and crash over time it will not hold the weight
Ive been there done that